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Theorem pnfnre 8068
Description: Plus infinity is not a real number. (Contributed by NM, 13-Oct-2005.)
Assertion
Ref Expression
pnfnre  |- +oo  e/  RR

Proof of Theorem pnfnre
StepHypRef Expression
1 cnex 8003 . . . . . 6  |-  CC  e.  _V
21uniex 4472 . . . . 5  |-  U. CC  e.  _V
3 pwuninel2 6340 . . . . 5  |-  ( U. CC  e.  _V  ->  -.  ~P U. CC  e.  CC )
42, 3ax-mp 5 . . . 4  |-  -.  ~P U. CC  e.  CC
5 df-pnf 8063 . . . . 5  |- +oo  =  ~P U. CC
65eleq1i 2262 . . . 4  |-  ( +oo  e.  CC  <->  ~P U. CC  e.  CC )
74, 6mtbir 672 . . 3  |-  -. +oo  e.  CC
8 recn 8012 . . 3  |-  ( +oo  e.  RR  -> +oo  e.  CC )
97, 8mto 663 . 2  |-  -. +oo  e.  RR
109nelir 2465 1  |- +oo  e/  RR
Colors of variables: wff set class
Syntax hints:   -. wn 3    e. wcel 2167    e/ wnel 2462   _Vcvv 2763   ~Pcpw 3605   U.cuni 3839   CCcc 7877   RRcr 7878   +oocpnf 8058
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 615  ax-in2 616  ax-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-13 2169  ax-14 2170  ax-ext 2178  ax-sep 4151  ax-un 4468  ax-cnex 7970  ax-resscn 7971
This theorem depends on definitions:  df-bi 117  df-tru 1367  df-fal 1370  df-nf 1475  df-sb 1777  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-nel 2463  df-rex 2481  df-rab 2484  df-v 2765  df-in 3163  df-ss 3170  df-pw 3607  df-uni 3840  df-pnf 8063
This theorem is referenced by:  renepnf  8074  nn0nepnf  9320  xrltnr  9854  pnfnlt  9862  xnn0lenn0nn0  9940  inftonninf  10534  pcgcd1  12497  pc2dvds  12499
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